NMR and dc-susceptibility studies of NaVGe2O6

Abstract

We report the results of measurements of the dc magnetic susceptibility chi(T) and of the 23Na nuclear magnetic resonance (NMR) response of NaVGe2O6, a material in which the V ions form a network of interacting one-dimensional spin S=1 chains. The experiments were made at temperatures between 2.5 and 300 K. The chi(T) data suggest that the formation of the expected low-temperature Haldane phase is intercepted by an antiferromagnetic phase transition at 18 K. The transition is also reflected in the 23Na NMR spectra and the corresponding spin-lattice relaxation rate 1/T1(T). In the ordered phase, 1/T1(T) decreases by orders of magnitude with decreasing temperature, indicating the formation of a gap of the order of 12 K in the magnetic excitation spectrum.

arXiv comment10 pages, 15 figures; v2 with minor revisions of the text

References in corpus (8)

• Stochastic series expansion method with operator-loop update
• Dynamics of coupled quantum spin chains
• Biquadratic interactions and spin-Peierls transition in the spin 1 chain LiVGe2O6
• Monte Carlo Study of the S=1/2 and S=1 Heisenberg Antiferromagnet on a Spatially Anisotropic Square Lattice
• Long-range antiferromagnetic order in the S=1 chain compound LiVGe2O6
• LiVGe2O6, an anomalous quasi 1D, $S=1$ system, as revealed by NMR
• High Magnetic Field NMR Studies of LiVGe${}_2$O${}_6$, a quasi 1-D Spin $S=1$ System
• Magnetization process for a quasi-one-dimensional S=1 antiferromagnet

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• Quenching of the Haldane gap in LiVSi2O6 and related compounds
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